Aik-bbush nozzle



Filed Jan. 27, 1927 Patented Jan.l 2,7, 1931 Y, l g

UNITED sTATrs v Y 1,790,513k

AUGUSTINE SHELBURNE, or s oUTH PASADENA, CALIFORNIA AIB-BRUSH Nozznn VApplication led January127, "1927. Serial No. 163,9015.

AMy invention is an air brush nozzle ofthe type for blowing paint or like material by means of compressed air, and having anair nozzle rotatable in relation'to the fluid nozzle, whereby a straight or spread jet of Huid may be had by injecting the air at a' lateral inclination on a central fluid jet.-

My invention pertains particularly tothe nozzle construction of an air brush of the type in which a central fluid jet has an annular air jet surrounding same andvejecting the fluid and also a pair of'lateral air jets- A. main object of my invention is to con-V struct the nozzle with the control device for the jets mounted in a floating manner in relation to the rotatable lateral air` jets. This causes the device to-have a self-centering ac'- tion so that the annular air jet and the liquid jet are in proper centeredfrelation. `The construction facilitates action ofthe lateral air jets.

ln constructing my Yinvention I use sub-- stantially a known type of air brush hav-ing i av suitablevtrigger Vcontrol or the like for a valve controlling the flow of liquid, the air brush stock has a bore in its outer end Vand a liquid tube is inserted in this bore, being connected to a liquid receptacle.V The space sur rounding the yliquid tube in the Vbore forms an air chamber, having connectionlwith a source of air-under pressure. The fluid tube has a iange on its outer end whichextends slightly beyond the circumferencer of the stock of the brush, there preferably being aV packing member betweenithe flange and the end of thestoclr. VThe tube terminates in a tapered dischargenozzle. e

The lateral rotatable air nozzle is connected to the flange of the liquid tube by means of a coupling nut which engages said flange on the side adjacent the 4stock i and allows tight or loose adjustment of the lateral air nozzle in reference to the liquid tube and its discharge nozzle. The air jet nozzle has aV pair of passages located diametrically opposite and the front of the flange of the liquid tube is provided with a plurality of passages which are substantially tan ent to the base of the cone forming the disc arge nozzle. rlhere lare a plurality of ducts through the flange fromthese passages to ,the `air chamber. By this construction there are provided a plurality of passages connecting to a plural-ity of ducts leading from the air chamber 0fiving sufhcient air to supply the annular jet as well as thelateral jets. j y My invention will be more readily understood from the following description and drawings, in which:

Figure 1 is a longitudinal sectional view of discharge end of an air brush. Y

Figure 2'is a side elevation of the liquid tube rwith its discharge nozzle and the uflange constructed integral with such tube. j Figure y3 is a front elevation of the discharge tube, taken in the direction of the arrow 3 of Fig. 2.

Figure 4 is a transverse section through the nozzle on the line 1E-enf Fig. 1 in the direc-V tion of the arrows. v i i i Figure 5 is an lend elevation of the nozzle taken in the direction of thearrow 5 of Fig. l1. In the drawings thefstock of the air brush is designated by the numeral 1 and has an enlarged bore 2 at the dischargeend. There is 85 a reduced threaded section 3 at the base of the bore leading into vthe liquid Vchamber l to which a liquid passage 5 connects, this passage being connected in any suitable manner to a liquid receptacle. `An air passage 6 extends through the upper part of the stock,

A there being an air opening 7 into thebore2.

The air passageis closed by'a plug 8 at its frontend. `The end 9 of the borek is preferably cylindrical. The air is suppliedto the brush in any suitable manner and may bein accordance with the construction set forth in Vmy Patent 1,586,010 issued May 25, 1926.

`The construction of the liquid tube is sub-V stantially as follows: 100

This tube is designated generally by the numeral 10, being shown in detail in Figs. 2 and 3. It comprises a tubular body structure 11, having a screw threaded end 12 to fit in the screw threads 3. A base ange 13 has a Washer 14 bearing on the seat 15 at the base of the bore 2. An outer flange 16 has a shoulder 17A on v-Whichis mounted a lWasher 18,lthis washer fitting against the end 19 of the stock. The nozzle 2O is cone shaped terminating in a slight cylindrical portion 21 to'fit inthe'air nozzle, as hereunder .et forth. A plurality of grooves 22 form air passages, being con nected by ducts 23 fromthe back offthe flange to the front of the flange. These ducts thus connect Withthe chamber formed in the-bore back of the flangeflG. This may-be designated the air'chamber 24. lt Will be noted that I illustrate four main air passages Which lare tangential to thebase of the cone lforming the liquid nozzle 20. These passages intersect and form a large air space 25 adjacent the perforated flange, separated by solid sections 26.

The air nozzle is-constructed suostantiallyas follows; having reference to Figs. 1, 4 and 5:

This nozzle is designated generally by the numeral 27 and hasa circular base 28, Which isconnected by an internally screw threaded coupling nut 29 to the flange 16, this coupling nut having an internally turned rim 30 engaging-the outerperiphery of the flange v16 on the shoulder 17, such shoulder projecting preferably beyond the circumferential part 9 of the stock. The air-'nozzle has an internal cone section 31,'thus forming an air jet chamber 32 for the annular a-iret nozzle 33, Which surroundsthe liquid nozzle 34. A pair of-opposite air passages-35'extend longitudinally of the air nozzle and have inwardly directed air discharge jets 36.

The flow of liquid is controlled by va Atapered valve member 37 Which is connected to a valve plug38 of the usualconstruction, this having `a stem l39 extending rearwardly Athrough lthe liquid tube across the liquid chamber 4 and out of the `rear end ofthe stock, there'beinga suitablepacking'40 forming a liquid tight seal.

The manner of usingvand functioning of my nozzle for air vbrushes is substantially as follows:

lt Will be understood that the flou7 oflliquid, such as paint, through the air tube `may be 4controlled in the usual manner by the valve 37 by manipulating the stem 39 and also by ythe pressure forcing the liquid `to the nozzle. The coupling nut 29 may be clampedtight so that the base portion of the air nozzle its pressed tightly against the outer surface of the flange 16 thereby bearing on the solidsections'26. llVhen theairlnozzleis in a-.position softhatthe-air passages 35' arein registry'yvith the solid sections 26 of fthe llange'lti, noan can pass through such passages and the lateral air jets 36 are inoperative. The air forced in under pressure to the air chamber 24, hoW ever, may pass through the air ducts 23 and discharge in the form of an annular air jet 33, surrounding the liquid jet. lVhen, however, theair nozzle is partly rotated so that the iairpassagesl are in fregistry with the .air space 25 at the end of the grooves or air passages 22, the air in addition is discharged throughthelateral air 'jets'36- The-coupling nut 29 rotates With the air nozzle when same is rotated and, if desired, this coupling nut may be connected somewhat loosely to the air nozzle so that it dees not bear tightly onithe shoulder 1-7 ofthe flange 16, in which case a certain amount offplay in a front-and rear 'direction and also acertain lateral Wabbling motion is allowed `the .air nozzle in `referenceto theliquid tube-and the liquid nozzle, therefore, when the nozzle is subject to airpressure in painting operations, the air nozzlehasia self-centering. function in relation tothe liquid nozzle thereby 1nai11- taining the annular jet surrounding` the liquid-nozzle artrue annulus and having thelliquid nozzle Aproperly centered therein. When the 'central air jet is properly centered sur roundingthe liquid jet, the lateralfair jets 36 are also properly centered so that the air dircharged ltherefroni impingcs in `the proper manner onithe central Yliquidjet, thus giving an'improved flou'` forthe liquid, such asfpaint, -Whenbeing sprayed. t isreadily understood'that the Iair nozzle `may be rotated `on the liquid nozzle when the coupling 'nut is slightly loose, just the saine as when same is fitted tight.

dnlthe above descriptionitwill be seen that I'haveconstructedan air brush nozzle which allows `proper centeringof the I'liquid and air jet v.by atypefof floating action between the structure forming suchjets and that I also provide passages fora ,large `flow of air for both theliquid and thelateral air fj ets.

Having described my invention, What .l

claim Fis '1. An 4airbrush nozzle ccmprisingincomblnation .an air I'brush 4stock `having a `liquid vnozzle connected thereto, an air\nozzle,-a nut havingza threaded engagement With the air '2. `Anair brush nozzle comprising in combination an air brush stock, airiiitegial liquid nozzle having a'flange connected thereto, `an

=air nozzle, a `nut threaded on theair nozzle,

inter-engaging means `between .the nutand the flange tolallow'the nut and ther-air nozzle to have a slight adjustn'ient relative toithe flange.

3. :An airlbrush nozzle comprising incombination'an air brushistoclthavingra bore at its outer end, an integral liquid nozzle having a tube, the tube being connected to the stock, forming a liquid tightconnection, a flange on the outer end ofthe tube having air ducts, means forming an air-tight connection with the end of the stock, there being an air passage through thestock into the bore, an air nozzle'having air ducts, a nut having threaded engagement with the air nozzle and inter-engaging means between the nut and the flange allowing slightmovement of the nut and the air nozzle relative to the liquid nozzle.

4. An air brush nozzle comprising in combination a stock having a bore in the end, with an air passage connected to said bore, a liquid nozzle having a tube, the said tube being threaded into thebase of the bore, v

there being a liquid passage in the stock connecting therewith, means forming a tight seal between the tube and the bore, a'flange on the tube, a gasket forming a tight connection between the flange and the en d of the stock, the flange having ain passages and air ducts therethrough, an air nozzle having air ducts, a nut threaded on said air noz.- zle, a rim on said nut, said rim having an engagement with the said flange, and securing the air nozzle inadjustable relation to the liquid nozzle. l

5. An air brush nozzle comprising in combination, an air brush stock having a bore at its outer end, a liquid nozzle having a tube inserted in the lbore and having a flange, a closure means between theV flange and the;

stock, a plurality of grooves on the face of the flange, air ducts through the flange fromV the bore to said grooves,.and an air nozzle having a plurality of Yair passages and jets rotatably bearing upon said flange.

6. An air brush nozzle comprising in combination, an air brush stock having a bore at its outer end, a ,liquid tube fitted in said bore and having a flange, means forming a seal between the flange and thestock, the tube having an integral-tapered liquid nozzle in the face side of the flange, the flange having a plurality of crossed grooves, airducts through the flange to said grooves, and an air nozzle having a plurality of air passages mounted against the face of the flange.

' 7. An air brush nozzle, as claimed in claim 6, said flange having solid sections adjacent its edge separated by air spaces, the air spaces being in registry with the air passages in the air nozzle in one position, the solid surfaces of the flange cutting od said air passages. Y p

8. An air brush nozzle comprising incombination, a liquid nozzle construction having a flange, there beinga stock with an air chamber back of the flange, the flange having av plurality of cross grooves forming air pas- Sages in its face, air ducts through the flange i to said passages, and an air nozzle having a plurality of air passages and air jets rotatably mounted on the face of the flange. Y.

9. An air brush nozzle, as claimed in claim 8, the liquid nozzle construction and the air nozzle forming an air jet chamber with a discharge outlet surrounding the liquid noz- AformV air passages surrounding .the tapered nozzle terminating in air spaces at the pe- Yriphery separated by solid sections,'there being air ducts from said grooves through the flange, an air nozzle havinga plurality of passages and lateral air jets, there being an air jet passage and an annular air jet nozzle surrounding the liquid nozzle, and means rotatably mounting the air nozzle on the flange, whereby on rotation of the air nozzle the said passages may register with the air spaces on the flange or with solid sections adjacent the periphery of the flange.

11. An air brush nozzle comprising in combination, an air stock having a bore at its outer end, a tubular liquid nozzle having a flange with crossed grooves on its outer face, air ducts through the flange from the grooves, an air nozzle having a plurality of air passages connecting to lateral air jets, and a couplingV nut screw threaded 'on the air nozzle and having a rim engaging ythe flange of the liquid nozzle. Y

12. An air brush nozzle comprising in combination'an air brush stock having a tubular liquid nozzle connected thereto, said nozzle having atapered outer end and an annular flange, a `nozzle positioned to bear tube and having a'pair of diametrically 'opposite air ducts, and a nut threaded on the air nozzle and having a flange inter-engaging with'the flange of thev said tubeof the liquid l A. SHELBURNE.

have signed my Vagainst said flange and tormingan annular passage with the tapered extension of the said 

